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Stock-Based Compensation - Schedule of Outstanding Stock Options (Details) (USD $)	12 Months Ended
	May 31, 2014
Outstanding Stock Options
Shares	1,596,984
Weighted-average remaining contractual term (in years)	4 years 8 months 12 days
Weighted-average exercise prices (in usd per share)	$ 25.47
Exercisable Stock Options
Shares	1,122,446
Weighted-average exercise prices (in usd per share)	$ 27.35
Option Exercise Price Range, 12.33 to 18.17
Outstanding Stock Options
Shares	553,690
Weighted-average remaining contractual term (in years)	7 years 1 month 6 days
Weighted-average exercise prices (in usd per share)	$ 17.18
Exercisable Stock Options
Shares	238,880
Weighted-average exercise prices (in usd per share)	$ 15.87
Option Exercise Price Range, 25.06 to 30.54
Outstanding Stock Options
Shares	627,041
Weighted-average remaining contractual term (in years)	4 years 3 months 18 days
Weighted-average exercise prices (in usd per share)	$ 27.90
Exercisable Stock Options
Shares	467,313
Weighted-average exercise prices (in usd per share)	$ 28.33
Option Exercise Price Range, 31.84 to 38.13
Outstanding Stock Options
Shares	416,253
Weighted-average remaining contractual term (in years)	2 years
Weighted-average exercise prices (in usd per share)	$ 32.85
Exercisable Stock Options
Shares	416,253
Weighted-average exercise prices (in usd per share)	$ 32.85

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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